Prime Number Program In C (3 Simple Ways)

In this article, we are going to write a Prime Number Program In C.

We will make this program in the following way -:

  • Prime Number Program In C Using For Loop
  • Prime Number Program In C Using While Loop
  • Prime Number Program In C Using Do While Loop

To make this program, we will use the following concept given below.

If you do not know about these topics well, then you may not understand this program, so you should know about them in detail from the link given above.

Now without wasting time let’s start programming.

Prime Number Program In C
Prime Number Program In C

Prime Number Program In C Using For Loop

Algorithm

  • Program start
  • Declare Variable
  • Loop start
  • Check if condition
  • Desplay result According to Condition
  • Program End

Program

//C  Program to check prime number Using For loop

#include <stdio.h>
int main()
{

   int n, i, count = 0;

    printf("Enter a number to check prime number or not : ");
    scanf("%d",&n);

    for(i=2; i<n; ++i)
    {
        // check for non prime number
        if(n%i==0)
        {
            count=1;
            break;
        }
    }
    if (count==0)
        printf("%d is a prime number.",n);
    else
        printf("%d is not a prime number.",n);
}

Output

Enter a number to check prime number or not : 5
5 is a prime number.

Prime Number Program In C Using While Loop

Program

//C Program for Prime Number Using While Loop

#include <stdio.h>
int main()
{

   int n, i = 2, count = 0;

    printf("Enter number to check prime number or not : ");
    scanf("%d",&n);

    while(i<n)
    {
        // check for non prime number
        if(n%i==0)
        {
            count=1;
            break;
        }
        i++;
    }
    if (count==0)
        printf("%d is a prime number.",n);
    else
        printf("%d is not a prime number.",n);
}

Output

Enter number to check prime number or not : 17
17 is a prime number.

Prime Number Program In C Using Do While Loop

Program

//C program to check prime number using do while loop

#include <stdio.h>
int main()
{
   int n, i = 2, count = 0;

    printf("Enter a number to check prime number or not : ");
    scanf("%d",&n);

    do
    {
        // check for non prime number
        if(n%i==0)
        {
            count=1;
            break;
        }
        i++;
    }while(i<n);
    if (count==0)
        printf("%d is a prime number.",n);
    else
        printf("%d is not a prime number.",n);
}

Output

Enter a number to check prime number or not : 9
9 is not a prime number.

Conclusion

So friends, in this article, we have written a Prime Number Program In C In this ways.

  • Prime Number Program In C Using For Loop
  • Prime Number Program In C Using While Loop
  • Prime Number Program In C Using Do While Loop

If you have difficulty to understand any program or have any doubts or questions, then tell me in the comment below.

Jeetu Sahu is A Web Developer | Computer Engineer | Passionate about Coding, Competitive Programming, and Blogging

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